Craziest upsets in the history of the UFC!! Us as MMA fans love to see our favorite fighters win but when an upset happens it gives us a feeling nothing else can, a h*ly shit feeling Fom when GSP lost in what was meant to be another name on the resume to when Nate Diaz made the world stop submitting Conor McGregor we have neen spoiled with jaw droppings moments over the years and some of the numbers may surprise you Upsets are apart of the sport and nothing is guaranteed which makes MMA the greatest sport in the world Which was your biggest h*ly shit upset?
Few things in combat sports hit like a true upset. The AgentMMA newsroom is looking back at some of the most shocking results in UFC history, from a legendary champion's stunning loss to a submission that stopped the sport in its tracks.
The moments that defined the genre
Two fights stand out in any conversation about the UFC's wildest nights. Georges St-Pierre went into his loss as a dominant name expected to add another win to an already towering résumé. Instead, the result sent shockwaves through the sport and became a reminder that no reputation is bulletproof.
Then there is Nate Diaz's submission of Conor McGregor, a moment that left the MMA world stunned. McGregor was one of the biggest stars in the sport, and Diaz's finish flipped the script on a fight many saw going another way.
Both results share a common thread: the favorite carried the weight of expectation, and the underdog made them pay for it.
Why it matters
- Upsets show that MMA offers no guarantees. One mistake, one clean shot or one tight choke can erase years of dominance.
- They reshape divisions and reputations overnight, sending favorites back to the drawing board and elevating the men and women who beat them.
- They keep fans engaged, because every fight card carries the possibility of a moment nobody saw coming.
That unpredictability is a big part of why so many fans call MMA the greatest sport in the world. When the script gets torn up, it produces the kind of reaction that is hard to find anywhere else: disbelief, then a jolt of pure excitement.
Every fan has a pick for the most shocking result they have ever watched, and the debate rarely settles. Whether it was a fallen champion, a superstar caught in a submission or a long-shot who rose to the moment, the biggest upsets are the ones fans remember where they were watching.
Which upset left you the most stunned? It is a question with no wrong answer, only a long list of nights the cage reminded everyone how quickly things can change.
